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python dict setdefault

# set default values for all keys
d = collections.defaultdict(lambda:1)
# set default value for a key if not exist - will not modify dictionary
value = d.get(key,default_value)
# if key is in the dictionary: return value
# else: insert the default value as well as return it
dict_trie.setdefault(char,{})

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python dict setdefault

# set default values for all keys
d = collections.defaultdict(lambda:1)
# set default value for a key if not exist - will not modify dictionary
value = d.get(key,default_value)
# if key is in the dictionary: return value
# else: insert the default value as well as return it
dict_trie.setdefault(char,{})

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python dict setdefault

python dict setdefault

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